src/Biz/User/Event/ClassroomEventSubscriber.php

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<?php

namespace Biz\User\Event;

use AppBundle\Common\StringToolkit;
use Biz\User\Service\StatusService;
use Biz\Course\Service\MemberService;
use Codeages\Biz\Framework\Event\Event;
use Biz\Classroom\Service\ClassroomService;
use Codeages\PluginBundle\Event\EventSubscriber;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;

class ClassroomEventSubscriber extends EventSubscriber implements EventSubscriberInterface
{
    /**
     * @return mixed
     */
    public static function getSubscribedEvents()
    {
        return array(
            'classroom.join' => 'onClassroomJoin',
            'classroom.auditor_join' => 'onClassroomGuest',
        );
    }

    public function onClassroomJoin(Event $event)
    {
        $classroom = $event->getSubject();
        $userId = $event->getArgument('userId');

        $this->publishJoinStatus($classroom, $userId, 'become_student');
        $this->syncCourseStudents($classroom, $userId);
    }

    public function onClassroomGuest(Event $event)
    {
        $classroom = $event->getSubject();
        $userId = $event->getArgument('userId');
        // publish status
        $this->publishJoinStatus($classroom, $userId, 'become_auditor');
        //add user to classroom courses
        // $this->syncCourseStudents($classroom, $userId);
    }

    private function simplifyClassroom($classroom)
    {
        return array(
            'id' => $classroom['id'],
            'title' => $classroom['title'],
            'picture' => $classroom['middlePicture'],
            'about' => StringToolkit::plain($classroom['about'], 100),
            'price' => $classroom['price'],
        );
    }

    private function syncCourseStudents($classroom, $userId)
    {
        $courses = $this->getClassroomService()->findActiveCoursesByClassroomId($classroom['id']);
        if (empty($courses)) {
            return;